Soybean yield gaps and water productivity in the western U.S. Corn Belt

By P. Grassini, J. Torrion, Haishun Yang, J. Rees, D. Andersen, K. Cassman, J. Specht. 2015

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Sifting and winnowing: Analysis of farmer field data for soybean in the US North-Central region (2018, result): “These results are consistent with findings from previous research based on farmer data collected from small geographic areas (e.g., Grassini et al., 2015), multiyear, multi-location replicated field experiments (e.g., Bastidas et al., 2008, Rowntree et al., 2013; Mourtzinis et al., 2016) and…”
Benchmarking impact of nitrogen inputs on grain yield and environmental performance of producer fields in the western US Corn Belt (2020, methodology): “…by comparing average annual N fertilizer rates and yield derived from the NRD database against independent estimates from both producer survey data (Grassini et al., 2015; Gibson et al., 2019) and official statistics (USDA-NASS, http://quickstats.nass.usda.gov/; USDA-ERS,…”
Agronomic Practices for Reducing Wheat Yield Gaps: A Quantitative Appraisal of Progressive Producers (2019, unknown): “Although surveys with a greater number of observations are preferred (Calviño and Sadras, 2002; Lobell et al., 2005; Grassini et al., 2015; Rattalino Edreira et al., 2017), yield-determining variables have been identified using similar or smaller number of observations (e.”